Hello,
This feature is not available, unfortunately. However, it's been suggested and put on the Community Wishlist. :)
https://www.bungie.net/en/Forum/Post/140885111/0/0
English
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Thank you for your reply do you perhaps know if there is some way that if i can contact them directly to see if they can make it to where she could change her titan upon signing into her account, by perhaps them doing it manually on their side?
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That's not a feature, so it can't be done.